42238257 has 4 divisors (see below), whose sum is σ = 56317680. Its totient is φ = 28158836.

The previous prime is 42238253. The next prime is 42238267. The reversal of 42238257 is 75283224.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42238257 - 2² = 42238253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42238253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7039707 + ... + 7039712.

It is an arithmetic number, because the mean of its divisors is an integer number (14079420).

Almost surely, 2^42238257 is an apocalyptic number.

It is an amenable number.

42238257 is a deficient number, since it is larger than the sum of its proper divisors (14079423).

42238257 is a wasteful number, since it uses less digits than its factorization.

42238257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14079422.

The product of its digits is 26880, while the sum is 33.

The square root of 42238257 is about 6499.0966295324. The cubic root of 42238257 is about 348.2587173088.

The spelling of 42238257 in words is "forty-two million, two hundred thirty-eight thousand, two hundred fifty-seven".